Short answer, yes. Church, in any legitimate form, is never bad to attend, but it depends on your religion if you're questioning if it's looked down upon.
In the pentecostal church, it is called communion.
Quite simply, the bread and wine received at a Pentecostal church would not be Holy Communion.
Certainly - many Pentecostal churches are fine Christian churches. Some of their practices and beliefs might be different from my Presbyterian church, but I wouldn't have a problem attending one.
Everyone is welcome to attend services or mass in the church, but only a person who is an Orthodox Christian can receive Holy Communion in an Orthodox Church.
No, a Catholic should not receive communion in anything but a Catholic Church.
A classical Pentecostal church would be the Assembly of God Church.
The saints are the important people in the pentecostal church.
Elim Pentecostal Church was created in 1915.
The Pentecostal church STRONGLY discourages divorce.
International Pentecostal Holiness Church was created in 1911.
Indian Pentecostal Church of God was created in 1924.
Go to your local Catholic Church and ask them this question. I do know that once a month a mass is said with communion so you could attend that mass and have communion with the body of the church.